All permanents on the battlefield, other permanents must be able to produce at least . Tawnos is not summoning sick.
All permanents on the battlefield. Magistrate's Scepter has three charge counters on it. available each turn.
All permanents on the battlefield. {U}{R} available each turn.
Tawnos on the battlefield. All other cards in hand. {U}{R} available on your first turn, with available on each extra turn.
Myr Battlesphere in hand. All other permanents on the battlefield. {U}{R} available.